以下为句子列表：
英文: Classification, requirements, constitutions and operational principle of GFCI are introduced briefly. The properties and selection of the zero-phase sequcnce current transformer core and tripper for GFCI are in detail described.
中文: 简要介绍了漏电开关（GFCI）的分类、要求、结构及工作原理。详细叙述了漏电开关零序电流互感器及其铁芯，脱扣器的工作特性、材料选用。
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